Shock-absorber.



E. FLENUE.

SHOCK ABSOHBER.

APPLlcAHoN msn 1AN.16.1918.

Patented May 28, .1918i U el Ik e Mov, Emst Fl e nje byjww MKM.

l Aww.

giving some resiliency and flexibility to the operation of the device.

' When the spring recoils after being conipressed the piston 2 is movedupwardly and the valve 5 will close the ports i. The piston can thenmove upwardly only as fast as the liquid can be transferred through theports l2 and 13. 'lhis upward movement of the piston will tend toproducesuction which will act to draw out through the ports 18 anyliquid which may have been 'forced into the interior of the piston rodand will also create more or less of a vacuum in the interior of thepiston rod. This operation f results in increasing the resiliency ordexibility of the device. The hollow piston-rod, therefore, with theform of valve 14: provides means whereby the upward move ment of thepiston yis cushioned by compression of air in the interior of the.piston rod, and the downward movement is cushioned hy the forming of apartial vacuum within the piston rod.

ln iny present invention "l" have also 1orovided meansY to prevent 'theApiston fi'oin coming into contact with the upper end oi' the cylinderthereby making an undesirable elickin'g'noise.. Situated in the cylinderat its-upper end is a collar 20 whichclosely its the piston rod, saidcollar having the iange 21 that is clamped between the end of thecylinder and the cylinderhead 22. li@ during the operation of the devicethe piston should he forced elear to the upper end oi the cylinder, thenthe ports 12 will be earried inte the collar 2O and the collar will thusclese said ports. then the liquid can he transferred 'trein the upper tothe lower side of the piston only through the ports aand as there areonly two of these ports and they are `relatively small, theV"furtherupward movement oi the eisten-will be very materially checked.'The .ast movement of the piston will thus he cushioned so that itcannot strike the collar a sharp blow. The ports 13 are so situated thatwhen the piston is at the extreme upper limit of its movement, saidports are just When this occurs",V

inertes entering the collar. The collar is provided with a bevel 23 sothat the portsl 13 will not oe entirely closed even when the piston isat the extreme upper limit of its movement. W ith this arrangement,however, the move ment of the piston will be checked as itapproaches theupper end of the cylinder so that it cannot be brought with any forceagainst the colla-r 20.

'lhe improvements which l have incorporated in this device addmaterially to the flexibility and elasticity thereof.

l claim:

y 1. ln a shock` absorber, the combination with a cylinder, of a valvedpiston therein, a hollow piston rod secured to the pist-on and extendingthrough one end of the cylinder, said piston rod having ports thereinabove the piston, a. hollow piston valve situated within' the pistonrod, the outer end of said valve tting the interior of the piston rodand the inner end being of smaller diameter and provided with lat-eralports, a valve stem secured to said smaller end of the piston valve andextendiiw through the hollow piston Tod and bywhieh the larger end ofsaid piston valve may be adjusted atb control the ports in the pistonrod, the space within the hollow piston rod constituting an air chainherwhich has ceininunication with the space helow the piston threugh theports in the piston valve.

2. in a shock ahsorber, the combination with a cylinder adapted tocontain liquid, et a. vali/ ed piston therein, a hollow piston rodconnected to the pieten, said piston rod having two sets of portethereinA situated dil?- erent ydistances from the piston, a collarsituated within the cylinder at its upper end fitting the piston ree,said ports being so situated that when the piston is at the upper end ofthe cylinder the ports of one set are situated within and closed by thecollar and the ports oi" the other set are situated within and partiallyclosed by the collar.

in testimony whereof, l have signed my naine to this specification.

ETJNST FLTLNTJE.

